linux-kernel - [PATCH net-next 1/2] dt-bindings: net: dp83822: Add support for changing the transmit amplitude voltage

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Message-Id: <20250113-dp83822-tx-swing-v1-1-7ed5a9d80010@liebherr.com>
Date: Mon, 13 Jan 2025 06:40:12 +0100
From: Dimitri Fedrau via B4 Relay <devnull+dimitri.fedrau.liebherr.com@...nel.org>
To: Andrew Lunn <andrew+netdev@...n.ch>, 
 "David S. Miller" <davem@...emloft.net>, Eric Dumazet <edumazet@...gle.com>, 
 Jakub Kicinski <kuba@...nel.org>, Paolo Abeni <pabeni@...hat.com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, Andrew Davis <afd@...com>, 
 Andrew Lunn <andrew@...n.ch>, Heiner Kallweit <hkallweit1@...il.com>, 
 Russell King <linux@...linux.org.uk>
Cc: netdev@...r.kernel.org, devicetree@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Dimitri Fedrau <dimitri.fedrau@...bherr.com>, 
 Dimitri Fedrau <dima.fedrau@...il.com>
Subject: [PATCH net-next 1/2] dt-bindings: net: dp83822: Add support for
 changing the transmit amplitude voltage

From: Dimitri Fedrau <dimitri.fedrau@...bherr.com>

Add support for changing the transmit amplitude voltage in 100BASE-TX mode.
Add binding to support this feature.

Signed-off-by: Dimitri Fedrau <dimitri.fedrau@...bherr.com>
---
 Documentation/devicetree/bindings/net/ti,dp83822.yaml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Documentation/devicetree/bindings/net/ti,dp83822.yaml b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
index 50c24248df266f1950371b950cd9c4d417835f97..b44f7068011b8e594f2ba245c526f4f48e3c5963 100644
--- a/Documentation/devicetree/bindings/net/ti,dp83822.yaml
+++ b/Documentation/devicetree/bindings/net/ti,dp83822.yaml
@@ -122,6 +122,16 @@ properties:
       - free-running
       - recovered

+  ti,tx-amplitude-100base-tx-millivolt:
+    description: |
+       DP83822 PHY only.
+       Transmit amplitude voltage for 100BASE-TX in millivolt. When omitted,
+       the PHY's default will be left as is.
+    $ref: /schemas/types.yaml#/definitions/uint32
+    enum: [1600, 1633, 1667, 1700, 1733, 1767, 1800, 1833,
+           1867, 1900, 1933, 1967, 2000, 2033, 2067, 2100]
+    default: 2000
+
 required:
   - reg

@@ -137,6 +147,7 @@ examples:
         rx-internal-delay-ps = <1>;
         tx-internal-delay-ps = <1>;
         ti,gpio2-clk-out = "xi";
+        ti,tx-amplitude-100base-tx-millivolt = <2100>;
       };
     };

-- 
2.39.5